OTX-2 Expression as a Diagnostic Marker for Choroid Plexus Tumors

Area of Science:

• Neuropathology
• Oncology
• Immunohistochemistry

Background:

• Choroid plexus tumors are rare neuroepithelium-derived central nervous system neoplasms, predominantly affecting children.
• Diagnostic challenges arise due to their rarity and histomorphologic overlap with other intraventricular tumors.
• Accurate diagnosis is crucial for appropriate patient management and treatment strategies.

Purpose of the Study:

• To evaluate the diagnostic role of OTX-2 antibody expression in identifying choroid plexus tumors.
• To assess the specificity of OTX-2 in differentiating choroid plexus tumors from other intraventricular tumors.
• To contribute to improved diagnostic accuracy for rare central nervous system tumors.

Main Methods:

• Retrospective review of 34 surgically treated choroid plexus tumor cases (2011-2023).
• Comparative analysis using immunohistochemistry for OTX-2, S-100, and transthyretin.
• Inclusion of five cases each of atypical teratoid/rhabdoid tumor, germ cell tumor, ependymoma, and metastatic adenocarcinoma for differential diagnosis.

Main Results:

• OTX-2 expression patterns were analyzed in choroid plexus tumors and comparator intraventricular neoplasms.
• Immunohistochemical staining results were correlated with histomorphologic features and clinical data.
• The study identified specific OTX-2 expression profiles relevant to choroid plexus tumor diagnosis.

Conclusions:

• OTX-2 antibody expression is a valuable tool for the diagnosis of choroid plexus tumors.
• OTX-2 aids in distinguishing choroid plexus tumors from other challenging intraventricular tumors.
• This immunohistochemical marker enhances diagnostic precision in neuropathology.